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【单选题】
马蛔虫受精卵的有丝分裂与洋葱根尖分生区细胞有丝分裂差别的最根本原因是A.
前者细胞为圆球形，后者为正方形
B.
前者细胞中有中心体，后者细胞具有细胞壁
C.
前者由精子和卵细胞结合而成，后者则是有丝分裂形成的后代细胞
D.
前者细胞中无高尔基体，后者细胞中有高尔基体
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